Ball Clock by Hex2000 | Download free STL model | Printables.com
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A Congreve Rolling Ball Clock made by Devon Clocks Limited, in the style of the original patented an
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Mid 20th century 'Congreve' rolling ball clock, sloped arch and pierced brass movement, the central Arabic minute chapter ring flanked by hour and seconds dials, twin train driven eight day movement, -
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Bonhams : A 20th Century Congreve rolling ball clock,
